Question about releasing memory

Hello,

I'm trying to use mimalloc with my binary. And have questions about memory release to OS.
I have a memory storage, it allocates 300MB of memory.
Then I destroy it.
And expect to return memory back to OS, but instead I see memory is not returned.
Then I init another storage and memory grows by another 300MB.

Compiling mimalloc:

cmake -B cmake-build-dir/release -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_STANDARD=17

Compiling my binary with:

/usr/x86_64-linux-musl-cross/lib/mimalloc-1.7/libmimalloc.a

Added to main.cxx:

#include <mimalloc.h>
#include <mimalloc-override.h>

Compiling everything with Release build type.

What I see in process stats:

Started:
elgato    2429  2.0  0.1 272984  8808 pts/3    Sl+  17:57   0:00 build/linux_x64/lt2http

Storage init:
elgato    2429  1.4  4.0 797568 322636 pts/3   Sl+  17:57   0:00 build/linux_x64/lt2http

Storage destroyed:
elgato    2429  1.0  4.0 797712 322900 pts/3   Sl+  17:57   0:00 build/linux_x64/lt2http

Storage re-init:
elgato    2429  1.0  4.7 797712 381244 pts/3   Sl+  17:57   0:00 build/linux_x64/lt2http

Storage re-destroyed:
elgato    2429  0.8  4.7 797712 381244 pts/3   Sl+  17:57   0:01 build/linux_x64/lt2http

Stats after closing:

heap stats:     peak      total      freed    current       unit      count  
  reserved:   768.0 mb   768.0 mb   512.0 mb   256.0 mb       1 b              not all freed!
 committed:   745.9 mb   745.9 mb   512.0 mb   233.9 mb       1 b              not all freed!
     reset:     4.2 mb     5.4 mb     1.1 mb     4.2 mb       1 b              not all freed!
   touched:       0 b        0 b    606.3 mb  -606.3 mb       1 b              ok
  segments:      16        318        314          4                           not all freed!
-abandoned:       5          5          5          0                           ok
   -cached:       0          0          0          0                           ok
     pages:     300        353        325         28                           not all freed!
-abandoned:      30         30         30          0                           ok
 -extended:       0   
 -noretire:       0   
     mmaps:       0   
   commits:     198   
   threads:       7          7         12         -5                           ok
  searches:     0.0 avg
numa nodes:       1
   elapsed:     144.618 s
   process: user: 0.610 s, system: 0.552 s, faults: 0, rss: 372.6 mb, commit: 745.9 mb

I understand that mimalloc is probably keeping memory for re-use in future.
But is there any configuration, that can be changed to force memory release?

Start by reviewing the mimalloc configuration and memory-release behavior described in the issue, using the provided CMake command and mimalloc override setup. Reproduce the storage init, destroy, and re-init sequence, then compare the process statistics and heap stats; done means explaining whether the observed retention is expected and identifying a supported way to release memory, if one exists.